cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A205312 Number of (n+1) X 3 0..1 arrays with every 2 X 2 subblock having the same number of equal edges, and new values 0..1 introduced in row major order.

Table of values

n a(n)
1 20
2 84
3 376
4 1708
5 7784
6 35500
7 161928
8 738636
9 3369320
10 15369324
11 70107976
12 319801228
13 1458790184
14 6654348460
15 30354161928
16 138462112716
17 631602239720
18 2881086973164
19 13142230386376
20 59948977985548
21 273460429154984

List of values

[20, 84, 376, 1708, 7784, 35500, 161928, 738636, 3369320, 15369324, 70107976, 319801228, 1458790184, 6654348460, 30354161928, 138462112716, 631602239720, 2881086973164, 13142230386376, 59948977985548, 273460429154984]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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